Due to MSI restrictions, the MSI packages of MySQL 5.5.25a will treat the version as 5.5.26 internally; for example, as displayed by the Installation Wizard. MySQL itself reports the version as 5.5.25a; for example, if you check the value of the
VERSION() SQL function or the
version system variable.
A regression bug in the optimizer could cause excessive disk usage for
UPDATE statements on
InnoDB tables. For tables created with
OPTIMIZE TABLE can be used to recover excessive space used. For tables created in the
InnoDB system tablespace,it is necessary to perform a dump and restore into a new instance of the system tablespace. (Bug #65745, Bug #14248833)